Product details


Input voltage (type) DC/DC Topology Boost, Boost with Current Sink, Multi-Channel Vin (Min) (V) 4.5 Vin (Max) (V) 65 Iout (Max) (A) 0.2 Iq (Typ) (mA) 3.6 Features Adjustable Switch Frequency, Enable/Shutdown, Integrated Switch, Power Good, Soft Start, Thermal Shutdown Operating temperature range (C) -40 to 125 Dimming method PWM open-in-new Find other Illumination LED drivers

Package | Pins | Size

HTSSOP (PWP) 20 42 mm² 6.5 x 6.4 open-in-new Find other Illumination LED drivers


  • Boost Converter:
    • LM3492-Q1 is an Automotive Grade Product That is AEC Q100 Grade 1 Qualified
    • Very Wide Input Voltage Ranged From 4.5 V to 65 V
    • Programmable Soft Start
    • No Loop Compensation Required
    • Stable With Ceramic and Other Low ESR Capacitors With No Audible Noise
    • Nearly Constant Switching Frequency Programmable From 200 kHz to 1 MHz
  • Current Regulators:
    • Programmable LED Current from 50 mA to 200 mA
    • 1000:1 Contrast Ratio at a Dimming Frequency of More Than 3 kHz, Minimum LED Current Pulse Width is 300 ns
    • Two Individual Dimmable LED Strings up to 65 V, Total 15 W (Typically 28 LEDs at 150 mA)
    • Dynamic Headroom Control Maximizes Efficiency
    • Over-Power Protection
    • ±3% Current Accuracy
  • Supervisory Functions:
    • Precision Enable
    • COMM I/O Pin for Diagnostic and Commands
    • Thermal Shutdown Protection
    • Thermally Enhanced 20-Pin HTSSOP package
open-in-new Find other Illumination LED drivers


The LM3492/-Q1 integrates a boost converter and a two-channel current regulator to implement a high efficient and cost effective LED driver for driving two individually dimmable LED strings with a maximum power of 15 W and an output voltage of up to 65 V. The boost converter employs a proprietary Projected-On-Time control method to give a fast transient response with no compensation required, and a nearly constant switching frequency programmable from 200 kHz to 1 MHz. The application circuit is stable with ceramic capacitors and produces no audible noise on dimming. The programmable peak current limit and soft-start features reduce current surges at start-up, and an integrated 190 mΩ, 3.9-A N-Channel MOSFET switch minimizes the solution size.

The fast slew rate current regulator allows high frequency and narrow pulse width dimming signals to achieve a very high contrast ratio of 1000:1 at a dimming frequency of more than 3 kHz. The LED current is programmable from 50 mA to 200 mA by a single resistor.

To maximize the efficiency, Dynamic Headroom Control (DHC) automatically adjusts the output voltage to a minimum. DHC also facilitates a single BOM for different number of LED in a string, which is required for backlight panels of different size, thereby reducing overall development time and cost. The LM3492/-Q1 comes with a versatile COMM pin which serves as a bidirectional I/O pin interfacing with an external MCU for the following functions: power-good, overtemperature, IOUT overvoltage and undervoltage indications, switching frequency tuning, and channel 1 disabling. Other supervisory functions of the LM3492/-Q1 include precise enable, VCC undervoltage lockout, current regulator over-power protection, and thermal shutdown protection. The LM3492/-Q1 is available in the thermally enhanced 20-pin HTSSOP package.

open-in-new Find other Illumination LED drivers
Similar products you might be interested in
Exact equivalent in functionality and parametrics to the compared device:
LM3492-Q1 ACTIVE Automotive 2-channel individual dimmable LED driver with boost converter and fast current regulator LM3492-Q1 is an automotive qualified version of LM3492.

Technical documentation

= Top documentation for this product selected by TI
No results found. Please clear your search and try again. View all 9
Type Title Date
* Datasheet LM3492/-Q1 Two-Channel Individual Dimmable LED Driver With Boost Converter and Fast Current Regulator datasheet (Rev. D) Oct. 31, 2016
Selection guide Power Management Guide 2018 (Rev. R) Jun. 25, 2018
Technical articles Here's how body electronics and lighting technology are changing the driving experience Sep. 26, 2016
Technical articles LED brightness adjustment: high-frequency PWM dimming Aug. 26, 2016
Technical articles Take better selfies with innovative LED flashes Nov. 18, 2014
Technical articles Solving the automotive EMI issues in new cars with all the screens Sep. 10, 2014
Application note AN-1656 Design Challenges of Switching LED Drivers (Rev. A) May 03, 2013
User guide AN-2056 LM3492 Evaluation Board Reference Design (Rev. B) May 01, 2013
Application note AN-2192 LM3492 12VAC, 7W LED Driver for AR111 Application (Rev. A) May 01, 2013

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development


The LM3492 demonstration board included in this package is designed for converting nominal 12VAC from electronic transformer output to drive seven series connected LEDs at 360- mA average current. The end user can directly light up a LED string through the demonstration board from an electronic (...)

  • Drop-in compatible with electronic transformers
  • Excellent compatibility with various electronic transformers
  • Regulated LED current
  • Flicker free operation

The LM3492 integrates a boost converter and a two-channel current regulator to implement a high efficient and cost effective LED driver for driving two individually dimmable LED strings with a maximum power of 15W and an output voltage of up to 65V. The boost converter employs a proprietary (...)

Design tools & simulation

PSpice® for TI design and simulation tool
PSPICE-FOR-TI — PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)

Reference designs

LM3492 - 12VAC, 7W LED Driver for AR111 Application
PMP8003 — This demonstration board highlights the performance of a LM3492 - 7watt LED driver that can be used to power a single / double LED string consisting of 6 / 7 series connected LEDs with 360mA from an Electronic Transfromer or 50/60 Hz transfomer or DC supply source. This is a two-layer board using (...)

CAD/CAE symbols

Package Pins Download
HTSSOP (PWP) 20 View options

Ordering & quality

Information included:
  • RoHS
  • Device marking
  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring

Recommended products may have parameters, evaluation modules or reference designs related to this TI product.

Support & training

TI E2E™ forums with technical support from TI engineers

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​​​​​​​


Related videos